The electrical properties of the mineral beneficiation power is the basis for the different electrical properties of the two minerals have been possible power dressing. The parameters indicating the electrical properties of the mineral mainly include the dielectric constant, electrical conductivity and relative electrical resistance, electrothermal property, specific conductivity and rectification of the mineral.
The dielectric constant is represented by the symbol e, and the larger e indicates the better conductivity of the mineral, and vice versa. In general, e>10~12 or above is a conductor, which can be separated by ordinary high-voltage power beneficiation, and those below this value are difficult to sort by conventional electric beneficiation method.
Generally, the mineral resistance referred to in electric beneficiation is the resistance when the mineral particle size is d = 1 mm, that is, the ohmic value. When the mineral resistance is less than 10 6 Ω, indicating that good conductivity, resistance is large one thousand 10 6 Ω and less than 10 7 Ω by the conductive medium, resistance of greater than 10 7 Ω, its poor electrical conductivity, can not use conventional electricity ores of .
The specific conductivity of minerals is the amount of electron flow or the elution of the ore particles. It is usually expressed by the ratio of the lowest voltage of the electron flow on the ore particles to the lowest voltage of the electrons flowing out on the graphite . The larger the value, the higher the minerals. The higher the voltage flowing out, the worse the conductivity.
Some minerals are only used as conductors when the high-voltage electrodes are negatively charged, while others are only used as conductors when the high-voltage electrodes are positively charged. Some minerals can be used as conductors regardless of the positive and negative of the high-voltage electrodes. Separation, this property of minerals is called rectification. The minerals that only get negative electricity are called negative rectification, such as quartz and zircon ; the minerals that only get positive charge are called positive rectification, such as calcite ; whether the electrode is positive or negative, the mineral can obtain electric charge, called full rectification. properties, such as cassiterite, magnetic iron ore.
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